Populating BDC_OKCODE from Z Program

In a Z program I wrote I am updating FB01 (bgr00, bbkpf, bbseg) using SAP program RFBIBL00. It processes fine but when I go into SM35 to process the records written I have to enter a BDC_OKCODE for every record written. This will take too long for the business to process the file. Is there anyway I can default the valus for the BDC_OKCODE in the program? Or is there some thing else I am missing?

- Helen